java util scanner class

### overview of the scanner class






3. **reading input**: the `scanner` class provides various methods to read different types of inputs:
- `next()`: reads the next token as a `string`.
- `nextline()`: reads the entire line as a `string`.
- `nextint()`: reads the next token as an `int`.
- `nextdouble()`: reads the next token as a `double`.
- `nextboolean()`: reads the next token as a `boolean`.

4. **closing the scanner**: it's a good practice to close the `scanner` object using the `close()` method when you're done with it to free up resources.

### example: using the scanner class

here's a simple example that demonstrates how to use the `scanner` class to read user input from the console.

### explanation of the code

3. **reading different types of input**:

4. **output**: the program prints a greeting message that includes the user's name, age, and height.

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